You could do something like this
% Make some example data
U1 = rand(101,101)
x = linspace(1,10,101);
% plot every 20th column of the data in a loop so it appears animated
tPause = 1; % pause time in seconds between displaying each curve
n = 20; % curve increments
numCol = size(U1,2); % number of columns in data matrix
numCurves = floor(numCol/n); % number of curves to be plotted
for k = 1:numCurves
plot(x,U1(:,k))
pause(tPause)
end
